Built in AD 191, this elaborate public fountain was once a large, two-storey complex with water features, mosaics, stone carvings and possibly a 600-sq-metre swimming pool – all dedicated to the nymphs. Excavations started in earnest in 1993, and restoration will continue for many years. Except for a few columns, an elegant archway and a few alcoves, there is little to see, though the workers toiling away may yet reveal hidden treasures in the years to come.